1. the completely dark central region of a shadow, especially during an eclipse
Usage: astronomy
2. a shadow or shaded area
Usage: literary

Examples

• During the solar eclipse, observers in the umbra experienced total darkness.
• The moon’s umbra swept across the Earth’s surface.
• Only those standing in the umbra could see the corona clearly.
• The umbra of the building provided cool relief from the sun.
• Scientists measured the size of the umbra cast by the satellite.
• The eclipse’s umbra was visible as a dark spot moving across the continent.